Claude Sonnet 4.5 vs Gemini 2.5 Pro
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Gemini 2.5 Pro by Google wins on 10 of 19 benchmarks against Claude Sonnet 4.5 by Anthropic, which leads on 7. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
General Intelligence: In general intelligence, Gemini 2.5 Pro scores 1465 on Chatbot Arena ELO compared to Claude Sonnet 4.5's 1380, while Gemini 2.5 Pro scores 84.0% on MMLU-Pro compared to Claude Sonnet 4.5's 83.0%, while both score 88.0% on IFEval, while Claude Sonnet 4.5 scores 21.2 on AA Intelligence Index compared to Gemini 2.5 Pro's 16.7.
Coding: In coding, Claude Sonnet 4.5 scores 90.0% on HumanEval+ compared to Gemini 2.5 Pro's 89.0%, while Claude Sonnet 4.5 scores 77.2% on SWE-bench Verified compared to Gemini 2.5 Pro's 63.8%, while Claude Sonnet 4.5 scores 62.0% on LiveCodeBench compared to Gemini 2.5 Pro's 58.0%, while Claude Sonnet 4.5 scores 52.1 on AA Coding Index compared to Gemini 2.5 Pro's 33.3.
Math: In math, Gemini 2.5 Pro scores 88.0% on MATH compared to Claude Sonnet 4.5's 87.0%, while both score 95.5% on GSM8K.
Reasoning: In reasoning, Gemini 2.5 Pro scores 84.0% on GPQA Diamond compared to Claude Sonnet 4.5's 83.4%, while Gemini 2.5 Pro scores 48.0% on ARC-AGI compared to Claude Sonnet 4.5's 45.0%, while Claude Sonnet 4.5 scores 17.5 on AA Agentic Index compared to Gemini 2.5 Pro's 3.5.
Context: In context, Gemini 2.5 Pro scores 1.0M on Context Length compared to Claude Sonnet 4.5's 1.0M.
Pricing Comparison
Claude Sonnet 4.5 costs $3.0/1M input tokens and $15.0/1M output tokens, while Gemini 2.5 Pro costs $1.3/1M input and $10.0/1M output. Gemini 2.5 Pro is the more affordable option for API usage.
Speed Comparison
Claude Sonnet 4.5 generates output at 67 tok/s compared to Gemini 2.5 Pro's 55 tok/s, and the time to first token is 1170 ms for Claude Sonnet 4.5 versus 500 ms for Gemini 2.5 Pro. Claude Sonnet 4.5 delivers faster throughput.
Verdict
For developers prioritizing coding and speed, Claude Sonnet 4.5 has the edge. For those who value general intelligence and math and affordability, Gemini 2.5 Pro is the stronger choice.
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Claude Sonnet 4.5 vs Gemini 2.5 Pro — FAQ
Which is better, Claude Sonnet 4.5 or Gemini 2.5 Pro?
Gemini 2.5 Pro wins on more benchmarks overall (10 vs 7). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Sonnet 4.5 compare to Gemini 2.5 Pro for coding?
Claude Sonnet 4.5 is better for coding, scoring 77.2% on SWE-bench Verified compared to 63.8%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Claude Sonnet 4.5 cheaper than Gemini 2.5 Pro?
Yes, Gemini 2.5 Pro is cheaper. Claude Sonnet 4.5 costs $3.0/1M input and $15.0/1M output tokens. Gemini 2.5 Pro costs $1.3/1M input and $10.0/1M output tokens.
Which is faster, Claude Sonnet 4.5 or Gemini 2.5 Pro?
Claude Sonnet 4.5 is faster, generating output at 67 tok/s compared to 55 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Claude Sonnet 4.5 vs Gemini 2.5 Pro comparison cover?
This comparison covers 19 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, IFEval, MATH, GPQA Diamond, SWE-bench Verified, Output Speed, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.